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Problem
5.
Starter motor cranks engine when Switching S1 to "I"
but engine does not fire.
6.
Engine fires but general alarm lamp (H2) remains
alight; compressor stops when releasing (S1).
7.
Engine is running but shuts down immediately after
S1 has been released
8.
General alarm lamp (H2) remains alight for over 5
seconds after starting.
9.
Hourmeter does not count running time.
10. Compressor does not unload and engine keeps run-
ning at maximum speed when closing the air outlet
valves; safety valve blows.
11. Compressor capacity or pressure below normal.
12. No air output.
13. Working pressure rises during operation and causes
safety valve to blow.
Possible faults
a.Switch (S1) defective,
b.Fuel solenoid (Y1) defective.
c.Low battery output.
a.Alternator drive belt broken or slipping,
b.Alternator/regulator defective.
a.Override switch released too soon.
b.Insufficient engine oil pressure.
c.Fuel tank contains insufficient fuel.
d.Engine oil pressure shut-down switch, engine tem-
perature switch or compressor temperature switch
defective.
a.Insufficient engine oil pressure or too high engine
coolant temperature.
b.Engine oil pressure switch (S3), or compressor
temperature switch (S5) defective.
c.Relay (K1) defective.
a.Hourmeter defective.
a.Air leaks in regulating system.
b.Regulating valve (RV) incorrectly set or defective.
c.Unloading valve (UV) or its actuating piston stuck.
a.Air consumption exceeds capacity of compressor.
b.Choked air filter element (AF).
c.Unloading valve (UV) not completely open.
d.Engine does not run at maximum speed.
e.Oil separator element (OS) clogged.
a.Drive coupling broken.
a.See faults 10.
b.Safety valve (SV) opens too soon.
- 40 -
Corrective actions
a.See remedy 4b.
b.Check solenoid and its valve; correct or replace as
necessary.
c.See 1a.
a.Check and correct as necessary.
b.Have assembly repaired.
a.Release switch after engine oil pressure has built up
to above the minimum allowed value.
b.Stop at once, consult the engine Instruction manual.
c.Fill fuel tank.
d.Remove and test switches. Replace if out of order.
a.Stop at once, consult Engine Operation Manual.
b.Stop at once, test switches, replace as necessary.
c.Replace (K1).
a.Replace.
a.Check and repair.
b.Adjust or repair regulating valve; see Adjustment
of the Continuous Regulating System.
c.Repair unloading valve assembly.
a.Check equipment connected.
b.Service air filter element (AF).
c.Speed regulation cable maladjusted; see Adjust-
ment of the Continuous Regulating System.
d.Check the maximum speed, service the fuel filter.
e.Have element removed and inspected by an Atlas
Copco Service representative.
a.Consult Atlas Copco.
a.See remedies 10.
b.Replace safety valve;
Consult Atlas Copco
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